6. Some of the exercises appear to be _____ ones that you have done, but after taking _____ second look, you will find that they are different.
Some of the doctors are paid almost ______ as the nurses.
. The government has to close those small factories to prevent the water of the river ______.
If you keep on, you will succeed ________.
—________ you__________ the editor at the airport? —No, when we got there, he___________ driven away.
Does the way you thought of___________ water clean make any sense?